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首页> 外文期刊>The Journal of Chemical Physics >Directed motion from particle size oscillations inside an asymmetric channel
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Directed motion from particle size oscillations inside an asymmetric channel

机译：来自非对称通道内的粒度振荡的定向运动

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摘要

The motion of a spherical Brownian particle in an asymmetric periodic channel is considered. Under an external periodic stimulus, the particle switches between two states with different particle radius, every half-period. Using Brownian dynamics simulations, we show that the particle size oscillation, combined with the asymmetry of the channel, induces a drift along the channel axis, directed towards the steeper wall of the channel. The oscillation of the particle size is accompanied by a time variation of the space accessible to the particle and by an oscillation of its diffusion coefficient. The former underlies the drift inducing mechanism of purely entropic nature. The latter, combined with the former, leads to a significant amplification of the effect. The drift velocity vanishes when interconversion between the states occurs either very slow or very fast, having a maximum in between. The position and magnitude of the maximum are discussed by providing an analytical approach based on intuitively appealing assumptions. Published by AIP Publishing.
机译：球形布朗粒子的以不对称的周期性信道的运动被考虑。下外部周期性激发，该颗粒具有不同的颗粒半径，每半周期的两个状态之间切换。使用布朗动力学模拟，我们表明，粒径振荡，与所述信道的不对称性结合，诱导沿着沟道轴的漂移，朝向通道的更陡壁。粒度的振荡伴随于粒子访问的空间的时间变化和由它的扩散系数的振荡。前者伏于漂移引起纯粹熵性质的机制。后者与前者，导致的效果显著放大相结合。当状态之间相互发生要么非常缓慢或非常快，具有之间的最大漂移速度消失。最大的位置和大小是通过提供基于直观吸引力的假设分析的方法进行讨论。通过AIP发布发布。

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